[PATCH v2 03/14] x86/mm/shadow: avoid assuming a specific Xen PAT

[Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>]

This makes the code easier to understand and more robust if Xen's PAT
ever changes.

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
---
 xen/arch/x86/mm/shadow/multi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c
index 
2370b3060285fee895f335f2a82d3d22ca5d31ed..4e94fec3d50cde0e5a26ecb62ff4d00dd00f759d
 100644
--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -629,8 +629,8 @@ _sh_propagate(struct vcpu *v,
     else if ( p2mt == p2m_mmio_direct &&
               rangeset_contains_singleton(mmio_ro_ranges, mfn_x(target_mfn)) )
     {
-        sflags &= ~(_PAGE_RW | _PAGE_PAT);
-        sflags |= _PAGE_PCD | _PAGE_PWT;
+        sflags &= ~(_PAGE_RW | PAGE_CACHE_ATTRS);
+        sflags |= _PAGE_UC;
     }
 
     // protect guest page tables
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab